GKE nodepool module update to create multiple identical nodepools.

• num_node_pools parameters defines number of nodepools to spin up.
• node_pool_names is a list of strings output that captures the names of the nodepools created.
• The job template module is update to accept this list of strings output.
• Examples which configure the nodeLabel in kueue configuration are also updated.

Submission Checklist

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Please take the following actions before submitting this pull request.

• Fork your PR branch from the Toolkit "develop" branch (not main)
• Test all changes with pre-commit in a local branch #
• Confirm that "make tests" passes all tests
• Add or modify unit tests to cover code changes
• Ensure that unit test coverage remains above 80%
• Update all applicable documentation
• Follow Cluster Toolkit Contribution guidelines #